Power system protection

Freja Line stability Secondary Injection-Using FREJA-300/306

Relay Testing (secondary Injection test) Using FREJA 306 Test kit.

Ansi Protection codes 1 – Master Element 2 – Time delay Starting or Closing Relay 3 – Checking or Interlocking Relay 4 – Master Contactor 5 – Stopping 6 – Starting Circuit Breaker 7 – Rate of Change Relay 8 – Control Power Disconnecting Device 9 – Reversing Device 10 – Unit Sequence Switch 11 – Multi-function Device 12 – Overspeed Device 13 – Synchronous-speed Device 14 – Underspeed Device 15 – Speed – or Frequency, Matching Device 16 – Data Communications Device 17 – Shunting or Discharge Switch 18 – Accelerating or Decelerating Device 19 – Starting to Running Transition Contractor 20 – Electrically Operated Valve 21 – Distance Relay 22 – Equalizer Circuit Breaker 23 – Temperature Control Device @ElecProtection 24 – Volts Per Hertz Relay 25 – Synchronizing or Synchronize-Check Device 26 – Apparatus Thermal Device 27 – Undervoltage Relay 27s- DC under voltage Relay 28 – Flame detector 29 – Isolating Contactor or Switch 30 – Annunciator Relay 31 – Separate Excitation 32 – Directional Power Relay or Reverse Power Relay 33 – Position Switch 34 – Master Sequence Device 35 – Brush-Operating or Slip-Ring Short-Circuiting Device 36 – Polarity or Polarizing Voltage Devices 37 – Undercurrent or Underpower Relay 38 – Bearing Protective Device 39 – Mechanical Condition Monitor 40 – Field (over/under excitation) Relay 41 – Field Circuit Breaker 42 – Running Circuit Breaker 43 – Manual Transfer or Selector Device 44 – Unit Sequence Starting Relay 45 –DC over voltage Relay 46 – Reverse-phase or Phase-Balance Current Relay 47 – Phase-Sequence or Phase-Balance Voltage Relay 48 – Incomplete Sequence Relay 49 – Machine or Transformer, Thermal Relay-OLR 50 – Instantaneous Overcurrent Relay 50G - Instantaneous Earth Over Current Relay (Neutral CT Method) 50N - Instantaneous Earth Over Current Relay (Residual Method) 50BF - Breaker failure 51 – AC Inverse Time Overcurrent Relay 51G- AC Inverse Time Earth Overcurrent Relay (Neutral CT Method) 51N- AC Inverse Time Earth Overcurrent Relay (Residual Method) 52 – AC Circuit Breaker 52a- AC Circuit Breaker Position (Contact Open when Breaker Open) 52b- AC Circuit Breaker Position (Contact Closed when Breaker Open) 53 – Exciter or DC Generator Relay 54 – Turning Gear Engaging Device 55 – Power Factor Relay 56 – Field Application Relay 57 – Short-Circuiting or Grounding Device 58 – Rectification Failure Relay 59 – Overvoltage Relay 60 – Voltage or Current Balance Relay 61 – Density Switch or Sensor 62 – Time-Delay Stopping or Opening Relay 63 – Pressure Switch 64 – Ground Detector Relay 64R - Restricted earth fault 64S - Stator earth fault 65 – Governor 66 – Notching or Jogging Device 67 – AC Directional Overcurrent Relay 68 – Blocking Relay 69 – Permissive Control Device 70 – Rheostat 71 – Liquid Level Switch 72 – DC Circuit Breaker 73 – Load-Resistor Contactor 74 – Alarm Relay 75 – Position Changing Mechanism 76 – DC Overcurrent Relay 77 – Telemetering Device 78 – Phase-Angle Measuring Relay or "Out-of-Step" Relay 79 – AC Reclosing Relay (Auto Reclosing) 80 – Flow Switch 81 – Frequency Relay 82 – DC Reclosing Relay 83 – Automatic Selective Control or Transfer Relay 84 – Operating Mechanism 85 – Communications,Carrier or Pilot-Wire Relay 86 – Lockout Relay/Master Trip 87 – Differential Protective Relay 88 – Auxiliary Motor or Motor Generator 89 – Line Switch 90 – Regulating Device 91 – Voltage Directional Relay 92 – Voltage and Power Directional Relay 93 – Field Changing Contactor 94 – Tripping or Trip-Free Relay( trip circuit supervisen Relay) 95 – For specific applications where other numbers are not suitable 96 – Busbar Trip Lockout relay 97 – For specific applications where other numbers are not suitable 98 – For specific applications where other numbers are not suitable 99 – For specific applications where other numbers are not suitable 150 – Earth Fault Indicator AFD – Arc Flash Detector CLK – Clock or Timing Source DDR – Dynamic Disturbance Recorder DFR – Digital Fault Recorder DME – Disturbance Monitor Equipment ENV – Environmental Data HIZ – High Impedance F

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